From: caternuson <caternuson@gmail.com>
Date: Thu, 26 Sep 2019 17:49:33 +0000 (-0700)
Subject: chunkify ft232h spi write
X-Git-Tag: 2.5.1^2
X-Git-Url: https://git.ayoreis.com/Adafruit_Blinka-hackapet.git/commitdiff_plain/b148cfd0cadee6314952abe09c34c6050f8afef5

chunkify ft232h spi write
---

diff --git a/src/adafruit_blinka/microcontroller/ft232h/spi.py b/src/adafruit_blinka/microcontroller/ft232h/spi.py
index fc7ad93..6a2d18f 100644
--- a/src/adafruit_blinka/microcontroller/ft232h/spi.py
+++ b/src/adafruit_blinka/microcontroller/ft232h/spi.py
@@ -32,7 +32,13 @@ class SPI:
     def write(self, buf, start=0, end=None):
         end = end if end else len(buf)
         port = self._spi.get_port(self.cs, self.freq, self.mode)
-        port.write(buf[start:end])
+        chunks, rest = divmod(end - start, self._spi.PAYLOAD_MAX_LENGTH)
+        for i in range(chunks):
+            chunk_start = start + i * self._spi.PAYLOAD_MAX_LENGTH
+            chunk_end = chunk_start + self._spi.PAYLOAD_MAX_LENGTH
+            port.write(buf[chunk_start:chunk_end])
+        if rest:
+            port.write(buf[-1*rest:])
 
     def readinto(self, buf, start=0, end=None, write_value=0):
         end = end if end else len(buf)